Volume details: (1) 18 (2) : (1) 18 (2, 518): 1-32, pls. 1-6 (1907); (1) 18 (2, 522): 33-72, pls. 7-12 (1907); (1) 18 (2, 526): 73-104, pls. 13-18 (1908); (1) 18 (2, 530): 105-136, pls. 19-24 (1908); (1) 18 (2, 534): 137-160, pls. 25-30 (1908); (1) 18 (2, 535): 161-184, pls. 31-36 (1909); (1) 18 (2, 538): 185-216, pls. 37-42 (1909); (1) 18 (2, 541): 217-248, pls. 43-48 (1910); (1) 18 (2, 542): 249-272, pls. 49-54 (1910); (1) 18 (2, 543): 273-296, pls. 55-60 (1910); (1) 18 (2, 544): 297-328, pls. 61-66 (1910); (1) 18 (2, 547): 329-391, pls. 67-70 (1911).